It is important to remember that the strength of a magnetic field decreases dramatically with increasing distance from the source. This means that the strength of the field reaching a house or structure will be significantly weaker than it was at its point of origin. For example, a magnetic field measuring This booklet, prepared in , contains the most recent NIEHS research on health and powerline electric and magnetic fields. If you are concerned about EMFs emitted by a power line or substation in your area, you can contact your local power company to schedule an on-site reading.
You can also measure EMFs yourself with the use of a gaussmeter, which is available for purchase online through a number of retailers. Use the browser controls to adjust the font size, or print this page.
The review found no evidence of any increased risk of cancer in adults. However, the NRPB was careful to explain that no causal link was found, and recommended that further studies are needed.
The evidence for the effect was inconclusive because the key studies in the review might have suffered from selection bias or random variation.
No proof of harm Despite the evidence for an increased risk of leukaemia in children exposed to higher than 0. No convincing evidence from animal studies to support the claim that EMF increases the risk of cancer. Victorian government policy The Victorian Department of Human Services supports the view that current guidelines on EMF and power lines are adequate, since the EMF generated by power lines is well below the recommended maximum limit of exposure. However, it is advisable to avoid heavy exposure, if possible.
Scientific evidence does not demonstrate a causal link between typical exposures to EMF and adverse health effects. Wertheimer, N. More information here. Moulder, J. Give feedback about this page. Was this page helpful? Yes No. View all environmental health. Related information. Overall, a person is more likely to experience damage if they are exposed to high levels of radiation over a longer period. This could occur, for example, if a person undergoes numerous X-rays without protection.
High doses of ionizing radiation can cause immediate damage , such as:. This form of radiation can also cause long-term health problems, even when a person has had no immediate symptoms.
Doctors and other healthcare providers can minimize the risk of exposure by using lead shields to protect areas of the body that are not targets for the radiation. Typical levels of exposure to non-ionizing radiation should not affect human health.
In ordinary circumstances, non-ionizing radiation simply passes through the body without causing harm. However, according to the American Heart Association AHA , pacemakers are not typically affected by radiation from household appliances, such as microwaves, computers, and Bluetooth wireless technology. Yet the AHA do recommend keeping antennae and motors roughly 6 inches away from a pacemaker or implantable cardioverter-defibrillator.
Other concerns have involved cell phones as a possible cause of cancer. As the authors of a article in the Indian Journal of Occupational and Environmental Medicine have noted, evidence of a connection between cell phone radiation and cancer has, so far, been weak and insubstantial.
Non-ionizing radiation can create heat, as in a microwave. While this heat is not typically dangerous, in certain circumstances, it can harm human body tissue. For example, people who work in industrial or scientific settings and who are exposed to very high doses of non-ionizing radiation may be at risk of tissue damage.
Certain organs are more vulnerable — the eyes and testes, for example, are more susceptible to this damage because they have a low blood supply and less capacity to regulate temperature.
Overall, the risk of damage from non-ionizing radiation is low, and it only occurs after a person has been exposed to high levels of the radiation for a long time. Acute radiation syndrome ARS , or radiation sickness, can be severe. It usually develops after exposure to very high levels of radiation in a short period, possibly minutes. A person with ARS may experience symptoms within minutes of exposure, and the symptoms may come and go for several days. According to the CDC , a person may recover for a period, then feel ill again, experiencing the same symptoms or others.
These can be severe, and may include:. A person should seek emergency medical aid if they think that they have been exposed to high levels of radiation.
In most cases, damage occurs after long-term exposure, such as when skin cancer develops after many years of frequent, unprotected sun exposure. People should seek medical attention if they have any symptoms of tissue damage or chronic radiation exposure, such as:.
In most cases, doctors focus on managing symptoms by keeping their patients hydrated and treating any burns.
0コメント